agent-device

Official

Overview Schema Related Servers Score Discussions

scroll

Navigate a device's content in any direction or to its edge, revealing off-screen elements for inspection or interaction.

Instructions

Scroll in a direction, or toward the top/bottom edge of scrollable content. The optional amount is the finger-path fraction of the viewport axis; app scroll physics determine the final content offset. Times out after 90s; a caller-supplied budget extends it.

Input Schema

TableJSON Schema

Name	Required	Description
`udid`	No	iOS device UDID selector.
`debug`	No	Enable debug diagnostics.
`runId`	No	Lease run identifier.
`amount`	No	Platform scroll amount.
`device`	No	Device name selector.
`pixels`	No	Pixel scroll amount.
`serial`	No	Android device or Vega VVD serial selector.
`settle`	No	After the action, wait for the UI to go quiet and return the settled diff vs the pre-action tree in the same response. Best-effort; never fails the action.
`target`	No	Alias for deviceTarget on commands without a UI target field. Interaction commands reserve target for the UI element.
`tenant`	No	Remote tenant identifier.
`leaseId`	No	Existing lease identifier.
`session`	No	Agent-device session name.
`noRecord`	No	Do not record this action.
`platform`	No	Platform selector used to resolve a device.
`direction`	Yes
`timeoutMs`	No	Settle: wait deadline in milliseconds (default 10000).
`durationMs`	No	Scroll duration in milliseconds when the backend supports pacing.
`includeCost`	No	Include per-command agent-cost (cost.wallClockMs, …) in structuredContent. Defaults to off; the default response shape is unchanged.
`deviceTarget`	No	Device target form. Maps to the CLI --target flag.
`responseLevel`	No	Response verbosity: token-cheap digest / default (today) / full. Defaults to default; the default response shape is unchanged.
`settleQuietMs`	No	Settle: quiet window in milliseconds (default 500).
`mcpOutputFormat`	No	MCP text content format. Defaults to optimized agent-friendly text; use json for JSON text. Structured content is always returned separately.
`androidDeviceAllowlist`	No	Android serial allowlist used for device resolution.

Output Schema

TableJSON Schema

Name	Required	Description
`edge`	No
`amount`	No
`passes`	No	Edge scrolls only: how many scroll-and-check passes ran.
`pixels`	No
`settle`	No
`message`	No
`direction`	Yes
`durationMs`	No

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed9 schema fields changedv0.20.10Aug 26, 2026

removedInput schema / properties / cwd

Removed value: -{
-  "description": "Working directory for command execution.",
-  "type": "string"
-}

removedInput schema / properties / daemonAuthToken

Removed value: -{
-  "description": "Remote daemon auth token.",
-  "type": "string"
-}

removedInput schema / properties / daemonBaseUrl

Removed value: -{
-  "description": "Remote daemon base URL.",
-  "type": "string"
-}

removedInput schema / properties / iosSimulatorDeviceSet

Removed value: -{
-  "description": "iOS simulator device-set path used for device resolution.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestDerivedDataPath

Removed value: -{
-  "description": "Derived data path for external iOS XCTest runner execution.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestEnvDir

Removed value: -{
-  "description": "Writable directory for iOS XCTest runner env overlays.",
-  "type": "string"
-}

removedInput schema / properties / iosXctestrunFile

Removed value: -{
-  "description": "Externally built iOS XCTest runner .xctestrun artifact path.",
-  "type": "string"
-}

removedInput schema / properties / stateDir

Removed value: -{
-  "description": "Agent-device state directory.",
-  "type": "string"
-}

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "direction": {
+      "enum": [
+        "up",
+        "down",
+        "left",
+        "right"
+      ],
+      "type": "string"
+    },
+    "durationMs": {
+      "type": "number"
+    },
+    "edge": {
+      "enum": [
+        "top",
+        "bottom"
+      ],
+      "type": "string"
+    },
+    "message": {
+      "type": "string"
+    },
+    "passes": {
+      "description": "Edge scrolls only: how many scroll-and-check passes ran.",
+      "type": "number"
+    },
+    "pixels": {
+      "type": "number"
+    },
+    "settle": {
+      "properties": {
+        "captures": {
+          "type": "number"
+        },
+        "diff": {
+          "description": "Settled diff vs the pre-action tree (changed lines only).",
+          "properties": {
+            "lines": {
+              "items": {
+                "properties": {
+                  "kind": {
+                    "enum": [
+                      "added",
+                      "removed"
+                    ],
+                    "type": "string"
+                  },
+                  "ref": {
+                    "description": "Plain ref body (e12) for added lines.",
+                    "type": "string"
+                  },
+                  "text": {
+                    "type": "string"
+                  }
+                },
+                "required": [
+                  "kind",
+                  "text"
+                ],
+                "type": "object"
+              },
+              "type": "array"
+            },
+            "summary": {
+              "properties": {
+                "additions": {
+                  "type": "number"
+                },
+                "removals": {
+                  "type": "number"
+                },
+                "unchanged": {
+                  "type": "number"
+                }
+              },
+              "required": [
+                "additions",
+                "removals",
+                "unchanged"
+              ],
+              "type": "object"
+            },
+            "truncated": {
+              "description": "Lines were capped to the response bound.",
+              "type": "boolean"
+            }
+          },
+          "required": [
+            "summary",
+            "lines"
+          ],
+          "type": "object"
+        },
+        "hint": {
+          "type": "string"
+        },
+        "quietMs": {
+          "type": "number"
+        },
+        "refs": {
+          "items": {
+            "properties": {
+              "ref": {
+                "description": "Plain ref body (e12) minted from the stored settled tree.",
+                "type": "string"
+              }
+            },
+            "required": [
+              "ref"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "refsGeneration": {
+          "description": "Snapshot generation of the stored settled tree; refs on added diff lines were minted from it.",
+          "type": "number"
+        },
+        "settled": {
+          "description": "Whether the UI held the quiet window before the deadline. false is advisory, not failure.",
+          "type": "boolean"
+        },
+        "tail": {
+          "description": "Unchanged interactive refs tail: still-present, actionable elements from the settled tree, attached only when diff carries zero added-line refs (a modal-dismiss/toast-only diff).",
+          "items": {
+            "properties": {
+              "label": {
+                "type": "string"
+              },
+              "ref": {
+                "description": "Plain ref body (e12) minted from the stored settled tree.",
+                "type": "string"
+              },
+              "role": {
+                "type": "string"
+              }
+            },
+            "required": [
+              "ref",
+              "role"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "tailTruncated": {
+          "description": "Present (true) when tail candidates exceeded the response cap.",
+          "type": "boolean"
+        },
+        "timeoutMs": {
+          "type": "number"
+        },
+        "waitedMs": {
+          "type": "number"
+        }
+      },
+      "required": [
+        "settled",
+        "waitedMs",
+        "captures",
+        "quietMs",
+        "timeoutMs"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "direction"
+  ],
+  "type": "object"
+}

Changed1 schema field changedv0.20.9Aug 19, 2026

changedInput schema / properties / platform / enum

Previous value: -[
-  "apple",
-  "android",
-  "vega",
-  "linux",
-  "web",
-  "ios",
-  "macos"
-]New value: +[
+  "apple",
+  "android",
+  "harmonyos",
+  "vega",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

Changed3 schema fields changedv0.20.6Aug 7, 2026

addedInput schema / properties / settle

Added value: +{
+  "description": "After the action, wait for the UI to go quiet and return the settled diff vs the pre-action tree in the same response. Best-effort; never fails the action.",
+  "type": "boolean"
+}

addedInput schema / properties / settleQuietMs

Added value: +{
+  "description": "Settle: quiet window in milliseconds (default 500).",
+  "minimum": 0,
+  "type": "integer"
+}

addedInput schema / properties / timeoutMs

Added value: +{
+  "description": "Settle: wait deadline in milliseconds (default 10000).",
+  "minimum": 1,
+  "type": "integer"
+}

Changed3 schema fields changedv0.20.2Jul 30, 2026

addedInput schema / properties / noRecord

Added value: +{
+  "description": "Do not record this action.",
+  "type": "boolean"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "apple",
-  "android",
-  "linux",
-  "web",
-  "ios",
-  "macos"
-]New value: +[
+  "apple",
+  "android",
+  "vega",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

changedInput schema / properties / serial / description

Previous value: -"Android serial selector."New value: +"Android device or Vega VVD serial selector."

Changed3 schema fields changedv0.17.11Jul 6, 2026

addedInput schema / properties / includeCost

Added value: +{
+  "description": "Include per-command agent-cost (cost.wallClockMs, …) in structuredContent. Defaults to off; the default response shape is unchanged.",
+  "type": "boolean"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "macos",
-  "android",
-  "linux",
-  "web",
-  "apple"
-]New value: +[
+  "apple",
+  "android",
+  "linux",
+  "web",
+  "ios",
+  "macos"
+]

addedInput schema / properties / responseLevel

Added value: +{
+  "description": "Response verbosity: token-cheap digest / default (today) / full. Defaults to default; the default response shape is unchanged.",
+  "enum": [
+    "digest",
+    "default",
+    "full"
+  ],
+  "type": "string"
+}

Changed1 schema field changedv0.17.9Jun 25, 2026

addedInput schema / properties / durationMs

Added value: +{
+  "description": "Scroll duration in milliseconds when the backend supports pacing.",
+  "maximum": 10000,
+  "minimum": 0,
+  "type": "integer"
+}

Changed1 schema field changedv0.17.7Jun 23, 2026

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "macos",
-  "android",
-  "linux",
-  "apple"
-]New value: +[
+  "ios",
+  "macos",
+  "android",
+  "linux",
+  "web",
+  "apple"
+]

Changed5 schema fields changedv0.17.6Jun 18, 2026

addedInput schema / properties / iosXctestDerivedDataPath

Added value: +{
+  "description": "Derived data path for external iOS XCTest runner execution.",
+  "type": "string"
+}

addedInput schema / properties / iosXctestEnvDir

Added value: +{
+  "description": "Writable directory for iOS XCTest runner env overlays.",
+  "type": "string"
+}

addedInput schema / properties / iosXctestrunFile

Added value: +{
+  "description": "Externally built iOS XCTest runner .xctestrun artifact path.",
+  "type": "string"
+}

addedInput schema / properties / mcpOutputFormat

Added value: +{
+  "description": "MCP text content format. Defaults to optimized agent-friendly text; use json for JSON text. Structured content is always returned separately.",
+  "enum": [
+    "optimized",
+    "json"
+  ],
+  "type": "string"
+}

changedInput schema / properties / platform / enum

Previous value: -[
-  "ios",
-  "android",
-  "macos",
-  "linux",
-  "apple"
-]New value: +[
+  "ios",
+  "macos",
+  "android",
+  "linux",
+  "apple"
+]

First observedv0.16.9Jun 3, 2026

TDQS

A3.7/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description carries the behavioral disclosure burden. It usefully reveals the 90-second timeout, the caller-supplied budget extension, and the fact that app scroll physics determine the final offset. It does not mention side effects like triggering navigation or lazy loading, but the core execution expectations are well covered.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two sentences with no filler. It front-loads the core purpose, then adds amount semantics and timeout behavior in a compact, scannable way.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the high schema coverage and presence of an output schema, this is a reasonably complete description for a 23-parameter interaction tool. The main gaps are the lack of sibling differentiation and the vague reference to a 'caller-supplied budget' that is not visible in the parameter schema, but neither prevents an agent from using the tool correctly in most cases.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The schema covers 96% of parameters, so the baseline is 3. The description adds meaningful semantic value for the key 'amount' parameter by defining it as a finger-path fraction of the viewport axis, and clarifies that top/bottom target edges of the scrollable content. This goes beyond the generic schema text.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific action ('Scroll'), a clear resource ('scrollable content'), and the direction/edge semantics via the direction enum values. However, it does not explicitly differentiate this tool from closely related siblings like swipe or gesture, so it stops short of a 5.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no guidance on when to use scroll versus alternatives such as swipe or gesture, and no exclusion conditions are stated. The amount semantics are explained, but that is a how-to detail rather than usage routing.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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